How the Cobra Jet intake compares with the factory intake on a GT350
By Steve Turner
We recently found out that the intake manifold atop the GT350’s Voodoo 5.2-liter engine is a great upgrade for the Coyote 5.0-liter in the Mustang GT. The intake seems to gain horsepower on the smaller engine without giving up any torque. That got our wheels spinning. How might Ford Performance Parts’ racy Cobra Jet intake perform atop the rev-happy Shelby’s engine? Fortunately VMP Performance owns a new GT350 and has the wherewithal to facilitate such a test.
We asked VMP’s Justin Starkey if he were willing to test the Cobra Jet intake on his new GT350, and he didn’t hesitate for a second. He ordered the intake and scheduled the dyno time. Once we arrived camera in hand, Justin was ready for even more science. He suggested that we also try a Mustang GT intake manifold as well.
“We’re still learning about the Voodoo,” Justin said. “Testing the different intakes helps us figure out where the power comes from. We know the cylinder head is better, the flat-plane crank is better, and the intake is apparently really fricking good.”
The most highly tuned naturally aspirated engines Ford Performance has produced to date made for an ideal test bed for intake manifolds. While the results might not translate directly to how these intakes will perform on a 5.0-liter, they do show the maximum potential of each design.
You can see the test runs in action right here…
“The GT intake showed us that even a Ti-VCT engine is not immune to low-end torque gain or loss from intake-runner design,” Justin added. “The Cobra Jet intake showed us that the stock GT350 intake is really good. There is a tiny bit of area under the curve on the CJ, but I don’t think I would ever run one on this car. It would be interesting to test the CJ versus GT350 on a conventional-crank 5.0-liter or 5.2-liter with the GT350 heads.”
As you would expect the GT intake was superior down low and in the midrange, however the Cobra Jet intake didn’t clearly wipe the floor with the stock GT350 intake. The CJ manifold was a little bit better than the GT350 as the rpm climbed so it might be the move on an all-out race car, but for the street the GT350 intake looks like the one to beat.
In all it was an interesting experiment and we hope to bring you more GT350 intake information in the future, so stay tuned.